Huh...so your app is up to date then. I was thinking you had a very old version of it. My apologies. As for the bookshelf style, I really wish they'd bring it back. I liked it a lot and was disappointed when it was removed. How I kept it? That was actually a long time ago not recently. At the time I had an iPod and the 3G iPhone, when I updated my iPhone I saw that the bookshelf look was replaced by the new background and wondering where the heck it went so I looked It up to see if it was just me and that's when I saw that it wasn't being brought back in the updated version. I deleted the app then reinstalled the old version of iBooks from iTunes since I didn't send the new version to iTunes yet and it worked so I just never updated the app on my iPod as well...until it started doing all the glitching, random crashing, and I just decided it wasn't worth the trouble so I sucked it up and updated. I still miss my bookshelf.
I have Dropbox and iCloud as well although I don't use either that much. Dropbox I use just in case an ebook I want on mobilism or other websites with free books are not compatible or preferable with iBooks such as a pdf, mobi, or lit format. I can save the file in Dropbox then use a conversion website to open the file from Dropbox to convert those formats to ePub so I can read it in iBooks with the scrolling feature.
What I actually meant about the low key website since I see the way I worded it was a bit off, sorry about that, was an alternative to mobilism for downloading books. Sorry if I confused you. It's pretty much a file sharing site but is so much easier because there aren't a bunch of ads and fake links on it. You just do a search, click the book, and it will have the link that says "open in iBooks" or "open with" and you can choose kindle or whatever other reader you have and you're good to go. It's not available on a desktop you can access the website but you can't actually download the books themselves, you can only do that on the mobile websites which iPhone and iPad support nicely. If i can't find the book I need there, that's when I come to mobilism as backup. Between these two sites I've found very book on my tbr list with the exception of one because it's only in paperback. If you're still interested in that website I can send it to you in a pm. I'm not sure if I'm allowed to post it here because there's so many rules on this website to remember. Just let me know, I also don't want to broadcast it so it doesn't get taken down again lol. I'm just a little selfish hahaha.
You have a ton of books!!! I envy you, but at the same time I'm a picky reader otherwise I'd probably have almost as much as you do. I'm so glad that books don't take up that much space either. It helps in the long run, I keep my music on my iPhone since I have more space on there that way I can use my iPad for apps, games, and my books go on both no matter what. I didn't know you could scan an ebook for viruses. Interesting, what program do you use? Sorry I couldn't help more I'd be pulling hair out if I were you. Hope you find a solution.